CN103675039A - Quality nondestructive testing method of friction welding head under heavy current - Google Patents
Quality nondestructive testing method of friction welding head under heavy current Download PDFInfo
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- CN103675039A CN103675039A CN201310653175.8A CN201310653175A CN103675039A CN 103675039 A CN103675039 A CN 103675039A CN 201310653175 A CN201310653175 A CN 201310653175A CN 103675039 A CN103675039 A CN 103675039A
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Abstract
A quality nondestructive testing method of a friction welding head under a heavy current comprises the following steps: 1, the two sides of a welding line of a weld part are respectively processed with a thread hole, conduction wires are fastened in the thread holes by screws, the other ends of the conduction wires are connected with a voltage meter, and threaded holes of different weld parts are processed in the same way and at the same location; 2, the weld part is placed in a testing device, and is fixed under the action of electrodes and spacing piles, 3, a heavy current perpendicular to the welding line direction is applied between the electrodes, 4, equidistant voltage drop between the two sides of the welding line is tested by the high-precision voltage meter, and 5, data processing, to be more specific, a tested pressure drop value is substituted into a pressure drop-effective welding area fitted equation of a joint to obtain an effective welding area and theoretical tensile properties of the joint, and the joint welding quality can be determined.
Description
Technical field
(bonding area is greater than 2000mm to the present invention relates to the field of non destructive testing of friction welding joint quality, particularly heavy in section
2) field of non destructive testing of friction welding (FW) postwelding quality.
Background technology
At China's friction welding method, be widely used at present, and the detection of its quality is absolutely necessary, especially in departments such as automobile, oil drilling tools, aircraft manufacturing and tool industries, the friction welding (FW) quality of requirement part must be absolutely reliable, although taked various quality assurance measures, friction welded defects happens occasionally.The weld defects of friction welding joint is mainly lack of penetration and welding crack, and the former occurs on face of weld, and the latter likely produces on face of weld and mother metal.Non-Destructive Testing for friction welding (FW) is one technical barrier always, and the unit having at present adopts supersonic testing method to detect the defect of friction welding joint.But this method is surveyed incomplete penetration defect, have certain difficulty, and because the surface appearance to measured piece there are certain requirements, and troublesome poeration, detection speed are also slow, therefore application is restricted.
For electrolytic aluminium anode aluminum guide-steel pawl friction weldment, because bonding area is large, weldment quality weight, being difficult to realize high efficiency postwelding detects, and because steel pawl casting flaw is many, shrinkage cavity, the judgement that casting flaw very easily affects ultrasound examination properties of weld such as be mingled with, therefore can not adopt ultrasonic method to detect.
Summary of the invention
the object of this invention is to provide a kind ofthe lossless detection method of friction welding joint quality under large electric current.
The present invention is the lossless detection method of friction welding joint quality under large electric current, the steps include:
(1) in the both sides of the weld seam 5 of weldment, respectively process a threaded hole 6, with screw, wire is fastened in threaded hole 6, at the other end of wire, connect voltage table 4, and guarantee that threaded hole 6 processing modes and the position of different weldments are identical;
(2) weldment is positioned in detection platform, by position limiting pile 1 and electrode 2, weldment is fixed; Weldment clamps, and two cube electrodes 2 compress respectively the metal of weld seam both sides under cylinder 3 promotes, and apply the detected pressures of 0.5-5MPa;
(3)in 2 heavy currents of connecting 7000-10000 ampere of electrode;
(4) read and record the joint both sides voltage drop value that under "on" position, high-accuracy voltage table 4 detects, repeat experimentation and obtain mean value;
(5) data processing, testing conditions lower sub pressure drop-effective seam area fit equation has been determined in the joint both sides voltage drop value substitution that detection is obtained:
y=?-0.00246x?+?150.1
In formula: x is effective seam area, the mm of unit
2; Y is for detecting voltage drop value, the mv of unit;
Now demarcate when weld seam tensile strength is greater than 68 ton hours and be judged to specification product, lower than 68 ton hours, be judged to defective;
The tensile strength of commercial-purity aluminium is 90MPa, and stretching load region is mainly greyness effective seam region in addition, and can be calculated the effective seam area of the limit is 7556mm
2, it is 131.5mv that substitution fit equation obtains weld seam two ends voltage drop value, when the pressure drop of arbitrary weldment joint is greater than ultimate value 131.5mv when adopting the method to detect, can judge that weldment quality is as defective weldment.
Compared with prior art, the invention has the beneficial effects as follows and can realize easy, quick, the reliable Non-Destructive Testing of friction welding joint.In addition owing to easily realizing automation mechanized operation, can realize efficient postwelding check, guarantee product quality, at friction welding (FW) field of non destructive testing, have broad application prospects.
Accompanying drawing explanation
Fig. 1 is the cannot-harm-detection device schematic diagram of friction welding joint quality under large electric current, in figure: 1-position limiting pile, 2-electrode, 3-cylinder, 4-high-accuracy voltage table, 5-aluminum steel friction welding seam, 6-threaded hole (check point).
Embodiment
As shown in Figure 1, the present invention is the lossless detection method of friction welding joint quality under large electric current, the steps include:
(1) in the both sides of the weld seam 5 of weldment, respectively process a threaded hole 6, with screw, wire is fastened in threaded hole 6, at the other end of wire, connect voltage table 4, and guarantee that threaded hole 6 processing modes and the position of different weldments are identical;
(2) weldment is positioned in detection platform, by position limiting pile 1 and electrode 2, weldment is fixed; Weldment clamps, and two cube electrodes 2 compress respectively the metal of weld seam both sides under cylinder 3 promotes, and apply the detected pressures of 0.5-5MPa;
(3)in 2 heavy currents of connecting 7000-10000 ampere of electrode;
(4) read and record the joint both sides voltage drop value that under "on" position, high-accuracy voltage table 4 detects, repeat experimentation and obtain mean value;
(5) data processing, testing conditions lower sub pressure drop-effective seam area fit equation has been determined in the joint both sides voltage drop value substitution that detection is obtained:
y=?-0.00246x?+?150.1
In formula: x is effective seam area, the mm of unit
2; Y is for detecting voltage drop value, the mv of unit;
Now demarcate when weld seam tensile strength is greater than 68 ton hours and be judged to specification product, lower than 68 ton hours, be judged to defective;
The tensile strength of commercial-purity aluminium is 90MPa, and stretching load region is mainly greyness effective seam region in addition, and can be calculated the effective seam area of the limit is 7556mm
2, it is 131.5mv that substitution fit equation obtains weld seam two ends voltage drop value, when the pressure drop of arbitrary weldment joint is greater than ultimate value 131.5mv when adopting the method to detect, can judge that weldment quality is as defective weldment.
As shown in Figure 1, the surface coverage insulating material of detection platform and position limiting pile 1.Electrode 2 is fixed on the push rod front end of cylinder 3, can under the effect of cylinder 3, do displacement and transmission of pressure.The direction of current of logical heavy current is perpendicular to weld seam 5, and the energising duration is 2-5s, switches on and is greater than 10s off time.
Joint pressure drop-effectively seam area fit equation is to obtain by changing the voltage drop detection matching experiment of joint area under same detection method, and the product of weak side's tensile strength in effective seam area and welding material is considered as to the theoretical stretching resistance that this joint can carry.
Judgement joint welding quality is to delimit the up-to-standard minimum stretching resistance of weldment according to production requirement, when the detected joint voltage drop value of certain weldment exceeds the corresponding voltage drop value of minimum stretching resistance, is judged as defective weldment.
Below in conjunction with accompanying drawing and example, the invention will be further described.
That defect in friction welding joint mainly contains is lack of penetration, slag inclusion, welding crack and greyness etc., the generation of these defects is mainly because the selection of welding conditions is improper caused, but for mature and stable welding conditions, also there is probability to occur weld defects, therefore friction weldment is carried out to very postwelding and detect very necessary.
This example detection object is electrolytic aluminum anode guide rod aluminium-steel friction weldment, and bonding area reaches 130 * 130mm
2, belong to heavy in section friction welding (FW).The major defect of heavy in section friction welding (FW) is that central area easily produces area excessive " greyness ", and the region of welding quality the best is the annular section of 2/3 inradius.When the large electric current of conducting, " greyness " produces conduction bottleneck because not forming effectively combination, and the electric currents of the overwhelming majority are from " greyness " effective seam area cirulating in addition, so the size of efficient weld area directly affects the resistance of joint area.
The device that this detection method is used comprises the level insulation detection platform that an area is 2m * 4m, platform surface is fixed with four 150mm (length) * 100mm (wide) * 200mm (height) position limiting pile and two cylinders, and it is 90 * 90 mm that cylinder front end is fixed with area
2copper electrode, electrode can be made displacement can transmission of pressure under cylinder drives; The low voltage heavy current transformer of a 200KW, current output terminal is communicated with two electrode blocks respectively, and provides down detection electric current in working order; Millivolt level high-accuracy voltage table and wire, screw are some, for detection of the equidistant pressure drop of weld seam both sides.
The concrete steps of this detection method are:
The first step, processes respectively two threaded holes in the weld seam both sides of weldment, and itself and weld spacing are 100mm, with screw, wire is fastened in threaded hole, and the wire other end connects voltage table;
Second step, is positioned over weldment on dedicated test platform, by position limiting pile and cylinder, weldment is fixed; Two cube electrodes and metal surface good contact, and under cylinder action, apply the pressure that pressure is 2MPA.
The 3rd step is connected the large electric current of 7100 amperes between electrode, and direction of current, perpendicular to weld seam, continues 2s each conduction time, and energising 20s off time, makes conducting position detected temperatures keep substantially constant;
The 4th step, reads and records the magnitude of voltage that under "on" position, high-accuracy voltage table detects; Repeat energising, testing process obtains mean value;
The 5th step, data processing, by the aluminum steel joint under the voltage drop value substitution electric current 7100A condition detecting " effectively the pressure drop of seam area-joint " fit equation:
y=?-0.00246x?+?150.1
(in formula: x: effective seam area, the mm of unit
2; Y: detect voltage drop value, the mv of unit)
Conversion obtains effective seam area of joint, and while stretching because of aluminum steel welding joint, rupture in aluminum mother plate in effective seam district, knows that fine aluminium tensile strength is 90-120MPa, therefore can obtain the theoretical stretching resistance of welding joint.
Contrived experiment under same detection method by changing the actual seam area of aluminium-steel joint and carrying out voltage drop detection, demarcated the relation between aluminium-steel joint under this electric current, this detection method " effectively seam area-joint pressure drop ", experimental result shows the pressure drop of friction welding joint place and seam area coinciding linear rule, and its fit equation is:
y=?-0.00246x?+?150.1
(in formula: x: effective seam area, the mm of unit
2; Y: detect voltage drop value, the mv of unit)
In conjunction with producing actual requirement, existing demarcation when weld seam tensile strength is greater than 68 ton hours is judged to specification product, lower than 68 ton hours, is judged to defective.Because the tensile strength of commercial-purity aluminium is 90MPa, and stretching load region is mainly the effective seam region beyond greyness, and can be calculated the effective seam area of the limit is 7556mm
2, it is 131.5mv that substitution fit equation obtains weld seam two ends voltage drop value, when the pressure drop of arbitrary weldment joint is greater than ultimate value 131.5mv when adopting the method to detect, can judge that weldment quality is as defective weldment.
Claims (6)
1. the lossless detection method of friction welding joint quality under large electric current, the steps include:
(1) in the both sides of the weld seam (5) of weldment, respectively process a threaded hole (6), with screw, wire is fastened in threaded hole (6), the other end at wire connects voltage table (4), and guarantees that threaded hole (6) processing mode and the position of different weldments are identical;
(2) weldment is positioned in detection platform, by position limiting pile (1) and electrode (2), weldment is fixed; Weldment clamps, and two cube electrodes (2) compress respectively the metal of weld seam both sides under cylinder (3) promotes, and apply the detected pressures of 0.5-5MPa;
(3)between electrode (2), connect the heavy current of 7000-10000 ampere;
(4) read and record the joint both sides voltage drop value that under "on" position, high-accuracy voltage table (4) detects, repeat experimentation and obtain mean value;
(5) data processing, testing conditions lower sub pressure drop-effective seam area fit equation has been determined in the joint both sides voltage drop value substitution that detection is obtained:
y=?-0.00246x?+?150.1
In formula: x is effective seam area, the mm of unit
2; Y is for detecting voltage drop value, the mv of unit;
Now demarcate when weld seam tensile strength is greater than 68 ton hours and be judged to specification product, lower than 68 ton hours, be judged to defective;
The tensile strength of commercial-purity aluminium is 90MPa, and stretching load region is mainly greyness effective seam region in addition, and can be calculated the effective seam area of the limit is 7556mm
2, it is 131.5mv that substitution fit equation obtains weld seam two ends voltage drop value, when the pressure drop of arbitrary weldment joint is greater than ultimate value 131.5mv when adopting the method to detect, can judge that weldment quality is as defective weldment.
2. the lossless detection method of friction welding joint quality under large electric current according to claim 1, is characterized in that the surface coverage insulating material of detection platform and position limiting pile (1).
3. the lossless detection method of friction welding joint quality under large electric current according to claim 1, is characterized in that electrode (2) is fixed on the push rod front end of cylinder (3), can under the effect of cylinder (3), do displacement and transmission of pressure.
4. the lossless detection method of friction welding joint quality under large electric current according to claim 1, is characterized in that the direction of current of logical heavy current is perpendicular to weld seam (5), and the energising duration is 2-5s, switches on and is greater than 10s off time.
5. the lossless detection method of friction welding joint quality under large electric current according to claim 1, it is characterized in that joint pressure drop-effectively seam area fit equation is to obtain by changing the voltage drop detection matching experiment of joint area under same detection method, and the product of weak side's tensile strength in effective seam area and welding material is considered as to the theoretical stretching resistance that this joint can carry.
6. the lossless detection method of friction welding joint quality under large electric current according to claim 1, it is characterized in that judging that joint welding quality is to delimit the up-to-standard minimum stretching resistance of weldment according to production requirement, when the detected joint voltage drop value of certain weldment exceeds the corresponding voltage drop value of minimum stretching resistance, be judged as defective weldment.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105181757A (en) * | 2015-10-12 | 2015-12-23 | 上海电机学院 | Detection device and method for copper-aluminum friction-stir welding firmness |
| CN107527003A (en) * | 2017-05-03 | 2017-12-29 | 武汉东智科技股份有限公司 | Ball-shaped camera camera lens adheres to the video quality diagnosing method of greyness |
| CN117943732A (en) * | 2024-03-25 | 2024-04-30 | 常州奇洛焊接科技有限公司 | Welding quality detection method, system, device and storage medium |
| CN117943732B (en) * | 2024-03-25 | 2024-06-28 | 常州奇洛焊接科技有限公司 | Welding quality detection method, system, device and storage medium |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105181757A (en) * | 2015-10-12 | 2015-12-23 | 上海电机学院 | Detection device and method for copper-aluminum friction-stir welding firmness |
| CN107527003A (en) * | 2017-05-03 | 2017-12-29 | 武汉东智科技股份有限公司 | Ball-shaped camera camera lens adheres to the video quality diagnosing method of greyness |
| CN107527003B (en) * | 2017-05-03 | 2020-09-04 | 武汉东智科技股份有限公司 | Video quality diagnosis method for dust spot adhered to lens of dome camera |
| CN117943732A (en) * | 2024-03-25 | 2024-04-30 | 常州奇洛焊接科技有限公司 | Welding quality detection method, system, device and storage medium |
| CN117943732B (en) * | 2024-03-25 | 2024-06-28 | 常州奇洛焊接科技有限公司 | Welding quality detection method, system, device and storage medium |
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